HOUSTON, Jan. 10 (Xinhua) -- The number of active drilling rigs in the United States fell by 15 to 781 this week, down by 294 rigs year-on-year, according to weekly data released by a Houston-based oilfield services company on Friday.
According to Baker Hughes, these active drilling rigs included 659 oil rigs operating in the U.S. oil fields, down by 11 from the previous week; 119 gas drilling rigs, down by four from the previous week; and three miscellaneous rigs, unchanged from last week.
The 781 rigs include 759 land drilling rigs, down by 14 from the previous week; 21 offshore drilling rigs, down by one; and one inland waters drilling rig which remained unchanged from last week.
Of them, 45 are directional drilling rigs, 698 are horizontal drilling rigs and 38 are vertical drilling rigs.
During the week, Oklahoma and Pennsylvania were the only two states that saw an increase of rig count with each of them adding one rig. Texas and Louisiana led the lost with seven and three, respectively.
The number of directional and vertical drilling rigs in the country both decreased by six this week and were respectively down 17 and 27 year-on-year. The count of horizontal rigs decreased by three and was down 250 year-on-year.
By far, the Permian Basin in western Texas and eastern New Mexico has been the largest source of shale oil production growth in the United States, having become an engine of supply growth outside the Organization of the Petroleum Exporting Countries in the past years.